import { isDate, isEmpty } from 'lodash'
import { ZonedDateTime } from '@js-joda/core'
import { format } from 'date-fns'
import '@js-joda/timezone'

import { BaseModel } from './base.model'

export const AvailabilityTimeStatusValues = ['scheduled', 'blocked', 'available'] as const
export type AvailabilityTimeStatus = typeof AvailabilityTimeStatusValues[number]

export class AvailabilityTime extends BaseModel<AvailabilityTime> {
  id: string
  appointment_id: string
  availability_id: string
  reason: string
  status: AvailabilityTimeStatus
  time: string
  user_id?: string
  timezone?: string

  get isAvailable(): boolean {
    return this.status === 'available'
  }

  get isScheduled(): boolean {
    return this.status === 'scheduled'
  }

  get hoursWithoutOffset(): string {
    return this.time?.slice(0, 5)
  }

  get offset(): string {
    let time = this.time?.slice(8)

    if (isEmpty(time)) return null

    if (time.length === 3) time = `${time}:00`

    return time
  }

  getUTCDate(date: Date): Date {
    const dateStr = isDate(date) ? format(date, 'yyyy-MM-dd') : date

    return new Date(`${dateStr}T${this.hoursWithoutOffset}${this.getOffsetOfByDateAndTimezone(date)}`)
  }

  setOffsetInTime(date: Date): void {
    this.time = `${this.hoursWithoutOffset}${this.getOffsetOfByDateAndTimezone(date)}`
  }

  setScheduled(appointmentId?: string): void {
    this.status = 'scheduled'

    if (appointmentId) this.appointment_id = appointmentId
  }

  free(): void {
    this.appointment_id = null
    this.status = 'available'
  }

  block(): void {
    this.appointment_id = null
    this.status = 'blocked'
  }

  private getOffsetOfByDateAndTimezone(date: Date): string {
    const dateStr = isDate(date) ? format(date, 'yyyy-MM-dd') : date

    const time = `${this.hoursWithoutOffset}${!this.offset ? 'Z' : this.offset}`

    return ZonedDateTime.parse(`${dateStr}T${time}[${this.timezone}]`)
      .offset()
      .toString()
  }
}